<?php // $Id: manage.php,v 1.7.2.8 2008/07/16 01:20:48 scyrma Exp $

require_once('../config.php');
require_once($CFG->libdir.'/tablelib.php');
require_once('lib.php');

define('SHOW_ALL_PAGE_SIZE', 50000);
define('DEFAULT_PAGE_SIZE', 30);

$tagschecked = optional_param('tagschecked', array(), PARAM_INT);
$newnames	= optional_param('newname', array(), PARAM_TAG);
$tagtypes	= optional_param('tagtypes', array(), PARAM_ALPHA);
$action	  = optional_param('action', '', PARAM_ALPHA);
$perpage	 = optional_param('perpage', DEFAULT_PAGE_SIZE, PARAM_INT);

require_login();

if (empty($CFG->usetags)) {
	print_error('tagsaredisabled', 'tag');
}

//managing tags requires moodle/tag:manage capability
$systemcontext   = get_context_instance(CONTEXT_SYSTEM);
require_capability('moodle/tag:manage', $systemcontext);

$navlinks = array();
$navlinks[] = array('name' => get_string('tags', 'tag'), 'link' => "{$CFG->wwwroot}/tag/search.php", 'type' => '');
$navlinks[] = array('name' => get_string('managetags', 'tag'), 'link' => '', 'type' => '');

$navigation = build_navigation($navlinks);
print_header_simple(get_string('managetags', 'tag'), '', $navigation);

$err_notice = '';
$notice = '';

// get all the possible tag types from db
$existing_tagtypes = array();
if ($ptypes = get_records_sql("SELECT DISTINCT(tagtype) FROM {$CFG->prefix}tag")) {
	foreach ($ptypes as $ptype) {
		$existing_tagtypes[$ptype->tagtype] = $ptype->tagtype;
	}
}
$existing_tagtypes['official'] = get_string('tagtype_official', 'tag');
$existing_tagtypes['default'] = get_string('tagtype_default', 'tag');

switch($action) {

	case 'delete':
		if (!data_submitted() or !confirm_sesskey()) {
			break;
		}
		
		$str_tagschecked = implode(', ', tag_get_name($tagschecked));
		tag_delete($tagschecked);
		$notice = $str_tagschecked.' --  '.get_string('deleted','tag');
		break;

	case 'reset':
		if (!data_submitted() or !confirm_sesskey()) {
			break;
		}
		$str_tagschecked = implode(', ', tag_get_name($tagschecked));
		tag_unset_flag($tagschecked);
		$notice = $str_tagschecked .' -- '. get_string('reset', 'tag');
		break;

	case 'changetype':
		if (!data_submitted() or !confirm_sesskey()) {
			break;
		}

		$changed = array();
		foreach ($tagschecked as $tag_id) {
			if (!array_key_exists($tagtypes[$tag_id], $existing_tagtypes)) {
				//can not add new types here!!
				continue;
			}

			// update tag type;
			if (tag_type_set($tag_id, $tagtypes[$tag_id])) {
				$changed[] = $tag_id;
			}
		}

		if (!empty($changed)) {
			$str_changed = implode(', ', tag_get_name($changed));
			$notice = $str_changed .' --  '. get_string('typechanged','tag');
		}
		break;

	case 'changename':
		if (!data_submitted() or !confirm_sesskey()) {
			break;
		}
		
		$tags_names_changed = array();
		foreach ($tagschecked as $tag_id) {
			if ($newnames[$tag_id] != '') {
				if (! $tags_names_updated[] = tag_rename($tag_id, $newnames[$tag_id]) ) {
					// if tag already exists, or is not a valid tag name, etc.
					$err_notice .= $newnames[$tag_id]. '-- ' . get_string('namesalreadybeeingused','tag').'<br />';
				} else {
					$tags_names_changed[$tag_id] = $newnames[$tag_id];
				}
			}
		}

		//notice to inform what tags had their names effectively updated
		if ($tags_names_changed){
			$notice = implode($tags_names_changed, ', ');
			$notice .= ' -- ' . get_string('updated','tag');
		}
		break;
	case 'addofficialtag':
		$new_otags = explode(',', optional_param('otagsadd', '', PARAM_TAG));
		$notice = '';
		foreach ( $new_otags as $new_otag ) {
			if ( $new_otag_id = tag_get_id($new_otag) ) {
				// tag exists, change the type
				tag_type_set($new_otag_id, 'official');
			} else {
				tag_add($new_otag, 'official');
			}
			$notice .= get_string('addedotag', 'tag', $new_otag) .' ';
		}
		break;
}

echo '<br/>';

if ($err_notice) {
	notify($err_notice, 'red');
}
if ($notice) {
	notify($notice, 'green');
}

// small form to add an official tag
print('<form class="tag-management-form" method="post" action="'.$CFG->wwwroot.'/tag/manage.php">');
print('<input type="hidden" name="action" value="addofficialtag">');
print('<div class="tag-management-form generalbox"><label class="accesshide" for="id_otagsadd">'. get_string('addotags', 'tag') .'</label>'.
	'<input name="otagsadd" id="id_otagsadd" type="text">'.
	'<input name="addotags" value="'. get_string('addotags', 'tag') .'" onclick="skipClientValidation = true;" id="id_addotags" type="submit">'.
	'</div>');
print('</form>');

//setup table

$tablecolumns = array('id', 'name', 'fullname', 'count', 'flag', 'timemodified', 'rawname', 'tagtype', '');
$tableheaders = array(get_string('id', 'tag'),
					  get_string('name', 'tag'),
					  get_string('owner', 'tag'),
					  get_string('count', 'tag'),
					  get_string('flag', 'tag'),
					  get_string('timemodified', 'tag'),
					  get_string('newname', 'tag'),
					  get_string('tagtype', 'tag'),
					  get_string('select', 'tag'));

$table = new flexible_table('tag-management-list-'.$USER->id);

$baseurl = $CFG->wwwroot.'/tag/manage.php?perpage='.$perpage;

$table->define_columns($tablecolumns);
$table->define_headers($tableheaders);
$table->define_baseurl($baseurl);

$table->sortable(true, 'flag', SORT_DESC);

$table->set_attribute('cellspacing', '0');
$table->set_attribute('id', 'tag-management-list');
$table->set_attribute('class', 'generaltable generalbox');

$table->set_control_variables(array(
TABLE_VAR_SORT	=> 'ssort',
TABLE_VAR_HIDE	=> 'shide',
TABLE_VAR_SHOW	=> 'sshow',
TABLE_VAR_IFIRST  => 'sifirst',
TABLE_VAR_ILAST   => 'silast',
TABLE_VAR_PAGE	=> 'spage'
));

$table->setup();

if ($table->get_sql_sort()) {
	$sort = 'ORDER BY '. $table->get_sql_sort();
} else {
	$sort = '';
}

if ($table->get_sql_where()) {
	$where = 'WHERE '. $table->get_sql_where();
} else {
	$where = '';
}

$query = 'SELECT tg.id, tg.name, tg.rawname, tg.tagtype, COUNT(ti.id) AS count, u.id AS owner, tg.flag, tg.timemodified, u.firstname, u.lastname '.
	'FROM '. $CFG->prefix .'tag_instance ti RIGHT JOIN '. $CFG->prefix .'tag tg ON tg.id = ti.tagid LEFT JOIN '. $CFG->prefix .'user u ON tg.userid = u.id '.
	$where .' '.
	'GROUP BY tg.id, tg.name, tg.rawname, tg.tagtype, u.id, tg.flag, tg.timemodified, u.firstname, u.lastname '.
	$sort;

$totalcount = count_records_sql('SELECT COUNT(DISTINCT(tg.id)) FROM '. $CFG->prefix .'tag tg LEFT JOIN '. $CFG->prefix .'user u ON u.id = tg.userid '. $where);

$table->initialbars(true); // always initial bars
$table->pagesize($perpage, $totalcount);

echo '<form class="tag-management-form" method="post" action="'.$CFG->wwwroot.'/tag/manage.php"><div>';

//retrieve tags from DB
if ($tagrecords = get_records_sql($query, $table->get_page_start(),  $table->get_page_size())) {

	$taglist = array_values($tagrecords);

	//print_tag_cloud(array_values(get_records_sql($query)), false);
	//populate table with data
	foreach ($taglist as $tag ){
		$id			 =   $tag->id;
		$name		   =   '<a href="'.$CFG->wwwroot.'/tag/index.php?id='.$tag->id.'">'. tag_display_name($tag) .'</a>';
		$owner		  =   '<a href="'.$CFG->wwwroot.'/user/view.php?id='.$tag->owner.'">' . fullname($tag) . '</a>';
		$count		  =   $tag->count;
		$flag		   =   $tag->flag;
		$timemodified   =   format_time(time() - $tag->timemodified);
		$checkbox	   =   '<input type="checkbox" name="tagschecked[]" value="'.$tag->id.'" />';
		$text		   =   '<input type="text" name="newname['.$tag->id.']" />';
		$tagtype		=   choose_from_menu($existing_tagtypes, 'tagtypes['.$tag->id.']', $tag->tagtype, '', '', '0', true);

		//if the tag if flagged, highlight it
		if ($tag->flag > 0) {
			$id = '<span class="flagged-tag">' . $id . '</span>';
			$name = '<span class="flagged-tag">' . $name . '</span>';
			$owner = '<span class="flagged-tag">' . $owner . '</span>';
			$count = '<span class="flagged-tag">' . $count . '</span>';
			$flag = '<span class="flagged-tag">' . $flag . '</span>';
			$timemodified = '<span class="flagged-tag">' . $timemodified . '</span>';
			$tagtype = '<span class="flagged-tag">'. $tagtype. '</span>';
		}

		$data = array($id, $name, $owner, $count, $flag, $timemodified, $text, $tagtype, $checkbox);

		$table->add_data($data);
	}

	echo '<input type="button" onclick="checkall()" value="'.get_string('selectall').'" /> ';
	echo '<input type="button" onclick="checknone()" value="'.get_string('deselectall').'" /> ';
	echo '<input type="hidden" name="sesskey" value="'.sesskey().'" /> ';
	echo '<br/><br/>';
	echo '<select id="menuformaction" name="action">
				<option value="" selected="selected">'. get_string('withselectedtags', 'tag') .'</option>
				<option value="reset">'. get_string('resetflag', 'tag') .'</option>
				<option value="delete">'. get_string('delete', 'tag') .'</option>
				<option value="changetype">'. get_string('changetype', 'tag') .'</option>
				<option value="changename">'. get_string('changename', 'tag') .'</option>
			</select>';

	echo '<button id="tag-management-submit" type="submit">'. get_string('ok') .'</button>';
}

$table->print_html();
echo '</div></form>';

if ($perpage == SHOW_ALL_PAGE_SIZE) {
	echo '<div id="showall"><a href="'. $baseurl .'&amp;perpage='. DEFAULT_PAGE_SIZE .'">'. get_string('showperpage', '', DEFAULT_PAGE_SIZE) .'</a></div>';

} else if ($totalcount > 0 and $perpage < $totalcount) {
	echo '<div id="showall"><a href="'. $baseurl .'&amp;perpage='. SHOW_ALL_PAGE_SIZE .'">'. get_string('showall', '', $totalcount) .'</a></div>';
}

echo '<br/>';

print_footer();

?>
